Relay for reinforcing sound.



J. H. CHRISTENSEN.

RELAY FOR REINFORUING SOUND.

APPLICATION FILED MAR.30,1905.

Patented N0v. 10, 1908 RELAY FOR REINFQRCING SOUND.

No. 903,811 Specification of Letters Patent. Patented Nov. 10, 19086 Application filed March 30, lbbfi. Serial N 0. 252,815. all whom it may concern: sure against the primary diaphragm can be Be it known that I, JENQHERMAN Cnnisindependently regulated. For this purpose,

, 'IENSEN, c vil engineer, resident of sovejen, the various carbon blocks, shown at k, are

specification.

Sollerod, Denmark, have invented a new fastened at the lower ends of slender rods J and useful Relay for Reinforcing Sound, or pendulums rand have a sharp edge in 0 which is fully set forth in the following contact with the diaphragm. 9 denotes the diaphragm and i the carbon plate glued or l y invention'relates to a relay for reinfastened thereto and forming a part thereof. orcing sound, particularly in connection .n thisoase the diaphragm is'disposed in a, with the ordinary receiving circuit of a televertical plane, and is acted upon by' a mag phone, or a telegraphone. f net 7) in the usual telephone or telegraphone e principal objectof the invention is to circuit. The various pendulums 1 are jourprovide a form of relay, or re-transmitting naled at s, so as to bear lightly against the parts, as hereinafter set forth and shown,

ing the ournal bearings which I employ.

with this diaphragm a resistance varying device, which shall amplify the ordinary vi face of the car rations, without destroying their purity, so diaphragm Q by the force of 'avity. In that t e sound may be finally reproduced practice I prefer to make use oi iewel'bean and delivered with suilicient intensity to be ings 2, which receive the spindle 1 of the heard even at a long distance from" the ap- .pendulums. The jewel bearings are sup? 5 ported in cups 4, of the terminal members 3, A further object of the invention is to said cups 4 having cavities 5 therein, which provide a loud speaking telephone of the contain mercury, by which a good electrical above character, adapted either for local use circuit is made to the pendulums therefrom. to reproduce the sound so it maybe readily ach of the various pendulumrods 1' has ieard,.or for repeating the sound into a seca weight a slidabl 7 supported upon its upond telephone circuit, forming a telephone per end and adjustable into any desired re. 30 relay, so that the sound may be re-transn itlation. The weight i normally so distrib ted to a distant point. utcd so that the center of gravity of each With these and other objects in view, my pendulum is a little below and almost in a invention consists in the construction, coinvertical line with its pivotal point. In this Way the pressure of the blocks laagainst the bination, in the location an arrangement of and finally particularly pointed out in the appended claims.

In the drawings, Figure l is a sectional view of a telephone relay embodying the principles of my invention; Fig. 2 is a front view thereof; Fi 3 1s a detail View Show permanence of the adjustment when it has instrument with a felt-lined case and suspend it from a'tixed point by rubber cords or ropes.

In operation the apparatus is connected .up so that the contacts lielin circuit with the repeating or retransmitting circuit in which there is preferably a battery of fairly of a diaphragm Whic is vibrated in an way, as, for example, under the impulses of a telephone circuit. I employ in connection means having carbon contacts included in the local circuit. I arrange-the carbon contacts in such a way that they are capable of varying the resistance of the repeating cirhigh potential, for example, eight or ten cuit through a wide range without dampenvolts. The resistance of the several coning to any appreciable extent the vibrations tacts is quite high, amounting tolOO or 200 of the primary diaphragm. The niannerin which this is accomplished constitutes an imcircuit should be wound with a resistance portant part of the invention. correspondingly high. Under these circum- A form of construction is illustrated in stances, the vibrations of the diaphragm 5 ohms, so that the receiver of the repeating i a which the inertia of the carbon blocks can no matter how feeble, give considerable vait made any desired amount, and their pres riations in the resistance of the various car into the path phragm, thereto and having a contact bearing against said diaphragm, said pendulum being supported by jewel bearings comprising a mercury the pendulum.

A telephone relay comprising a pendulum,

bon contacts. transmitted with an intensity considerably increased over its original value. I

If it is desired to move the instrument or ut it out of use temporarily, this can be readily accomplished by the cams a on the shaft X, which are disposed to be moved of the various pendulums. y indicates a limiting stop against which the pendulums are pressedin such action.

After the appliance has been in use for a certain length of time it is found that a fine carbon dust or powder collects at the various contacts, and this powder should not be brushed away or removed. Its presence is found to render the apparatus more efiie cient and less dependent on sensitive and delicate adjustments than otherwise.

hat I claim, is z- 1. A telephone relay comprising a diaphragm, a pendulum depending unrestrainedly adjacent thereto and having a sharp- The sound is accordingly reand bearings therefor consisting of a pair of oppositely disposed cups 4: containing mercury, said cups being closed by jewels 2 through which the axis of the pendulum extends into the mercury.

4. A telephone relay comprising a pendupair of oppositely disposed cups 4: containing mercury, said cups being closed by supof the pendulum extends into the mercury.

5. A telephone relay comprising -a iahragm, a pendulum depending adjacent to said diaphragm and bearing lightly thereagainst, a horizontal rod adjacent said edged carbon block in contact with said pendulum, and a cam or eccentric carr ed diaphragm, the center of gravity of the thereby for engaging said pendulum and pendulum being almost in a vertical line holding it away from said diaphragm. I 4

pressure between with its support and the carbon block beardiaphragm entirely by gravity, whereby there will be a very slight the carbon block and the specification in the presence of two subscribing witnesses.

JENS HERMAN cniusrnrsnn. Witnesses:

diaphragm, and the pendulum will swing I very'ireely. Vrceo BLOM,

2. A telephone relay comprismg a dia- F. A. USSING.

lum, and bearings therefor consisting of a In-testimony whereof I have signed this a pendulum depending adjacent j contact for conducting current through orting members 2 through which the arms 

